architecture-patterns

Clean Architecture and Hexagonal Architecture both isolate domain logic from external concerns, but Clean Architecture organizes dependencies into concentric layers, while Hexagonal Architecture uses ports and adapters to decouple the application core from infrastructure.

Use CQRS and Event Sourcing when a microservice has complex read/write requirements and needs strict auditability. CQRS separates read and write models, while Event Sourcing stores state changes as a sequence of immutable events for full history reconstruction.

Choose the right software architecture pattern by evaluating project complexity and specific requirements. This involves comparing the use cases, trade-offs, and anti-patterns of Clean Architecture, Hexagonal Architecture, DDD, CQRS, and Event Sourcing to find the best fit.

You should avoid Domain-Driven Design for simple projects lacking complex business logic, as its strategic design overhead provides little benefit. DDD is intended for complex domains requiring detailed modeling, and applying it to basic CRUD operations is an anti-pattern.

Hexagonal Architecture works for microservices with high read/write complexity by protecting the domain core, but it does not inherently separate read and write models like CQRS. You may need to combine it with CQRS for optimized query performance and auditability.